{*****************************************************************************
 *                     SAMPLE5.PAS : DIGITAL OUTPUT                          *
 *                                                                           *
 *  This is a demonstration program to be used with the AD12-16 A/D          *
 *  board.  The program will prompt the user for a digital value between 0   *
 *  15. The program will output this value to digital output bits and then   *
 *  read it back on the digital input channels. This demos setting the       *
 *  digital output bits(task 13)and reading the digital input bits(task 14). *
 *                                                                           *
 *  The board should be set as follows:                                      *
 *      -- IRQ5 is used for interrupts                                       *
 *      -- Polarity set to bipolar                                           *
 *      -- DMA channel 1                                                     *
 *      -- On board clock set to 1 MHz                                       *
 *  Also, the following jumps should be installed.                           *
 *      -- OP0 pin 23 to IP0 pin 25                                          *
 *      -- OP1 pin 4 to IP1 pin 6                                            *
 *      -- OP2 pin 22 to IP2 pin 24                                          *
 *      -- OP3 pin 3 to IP3 pin 5                                            *
 *                                                                           *
 *  LAST MODIFICATION: 2/3/98                                                *
 *                                                                           *
 *****************************************************************************}
program startup;
{$L a16drv}
{$F+}

USES crt;

type param_array = array[1..5] of integer;

{ all of the parameters passed to the A16DRV driver must be declared
 globally, including the buffers which have their offset passed inside
 the params array }

var  task,status        : integer;
     params             : param_array;
     ch                 : char;



procedure a16drv(t_off:word;p_off:word;st_off:word);external;


function AskForBaseAddress(OldOne : String) : Word;
const
   Msg : string[4] = '0';
var
   NewOne, Success, Dummy, Error : Word;
   AddrInputPosX, AddrInputPosY : Word;
begin
   if (OldOne = 'OLD') then OldOne := Msg;
   WriteLn('Please enter the Base Address (0000-FFFF) for your card (in hex)');
   WriteLn('or press ENTER for ', OldOne, '.  ');
   Write('>');
   AddrInputPosX := WhereX; AddrInputPosY := WhereY;
   repeat
      GotoXY(AddrInputPosX, AddrInputPosY);
      ClrEol;
      Readln(Msg);
      Val('$' + Msg, NewOne, Error);
      if (error=0) then begin
         Success := 1;
         Dummy := NewOne;
      end else if (Msg = '') then begin
         GotoXY(AddrInputPosX, AddrInputPosY);
         WriteLn(OldOne);
         Msg := OldOne;
         Success := 1;
         Val('$' + Msg, Dummy, Error);
      end;
   until (Success = 1);
   AskForBaseAddress := Dummy;
end;  { end of AskForBaseAddress }



{***************************************************************************
 * PROCEDURE: call_driver -- local routine                                 *
 *                                                                         *
 *   PURPOSE: Performs the call to the driver package.                     *
 *                                                                         *
 *     INPUT: None.                                                        *
 *                                                                         *
 *     CALLS: a16drv - entry point to driver package.                      *
 *                                                                         *
 *    OUTPUT: None.                                                        *
 *                                                                         *
 ***************************************************************************}
procedure call_driver;

var t_off,p_off,st_off : word;

begin

   { this section extracts the offset of the parameters that we will pass
      to the assembly driver }

   t_off := ofs(task);
   p_off := ofs(params[1]);
   st_off := ofs(status);
   status := 0;
   a16drv(t_off,p_off,st_off);

   { this section checks for an error code  }

   if status > 0 then
      begin
      WriteLn('A status error code of ',status,' was detected.');
      WriteLn('Program terminated.');
      end;
end; { call_driver }

{*****************************************************************************
 *  FUNCTION: setup -- local routine                                         *
 *                                                                           *
 *   PURPOSE: Sets up the driver package.                                    *
 *                                                                           *
 *     INPUT: None.                                                          *
 *                                                                           *
 *     CALLS: call_driver - entry point to driver package.                   *
 *                                                                           *
 *    OUTPUT: Returns the error code supplied by the driver routine.         *
 *                                                                           *
 *****************************************************************************}
procedure setup(Address:word);

var I              :integer;

begin

   { initialize the board }

   task := 0;
   params[1] := Address; { starting board address }
   params[2] := 5;       { IRQ5 }
   params[3] := 1;       { DMA channel 1 }
   call_driver;          { call routine to call ext module }
   if status <> 0 then exit;
end; {procedure setup }

{*****************************************************************************
 *  FUNCTION: get_readings -- local routine                                  *
 *                                                                           *
 *   PURPOSE: Prompts for a digital value, writes it then reads it back.     *
 *                                                                           *
 *     INPUT: None.                                                          *
 *                                                                           *
 *     CALLS: call_driver - entry point to driver package.                   *
 *                                                                           *
 *    OUTPUT: Returns the error code supplied by the driver routine.         *
 *****************************************************************************}
procedure get_readings;

var I                 :integer;

begin
ClrScr;

   { fetch the digital value to output}
   WriteLn;WriteLn;
   write('Enter the digital value to output(0 - 15): ');
   readln(params[1]);

   { write the counts to the digital outputs }

   task := 13;
   call_driver;             { call routine to call ext module }
   if status <> 0 then  exit; { if status > 0 then error }

   { delay for a little }

   I := 0;
   while I < 1000 do I:=I+1;

   { read the digital inputs}

   task := 14;
   call_driver;

   { now display the digital inputs }
   WriteLn;
   WriteLn('The value read back is:',params[1]);
end; { get_readings }

{**************************************************************************
 * PROCEDURE: main -- local routine                                       *
 *                                                                        *
 *   PURPOSE: Controls program flow, detects when user is ready to exit.  *
 *                                                                        *
 *     INPUT: None.                                                       *
 *                                                                        *
 *     CALLS: setup - set up program and drivers.                         *
 *            get_readings - write and read the digital values.           *
 *                                                                        *
 *    OUTPUT: None.                                                       *
 *                                                                        *
 **************************************************************************}
var
   Address:word;
BEGIN
   ClrScr;
   WriteLn('                     SAMPLE5.PAS : DIGITAL OUTPUT                          ');
   WriteLn;
   WriteLn('This is a demonstration program to be used with the AD12-16 A/D    ');
   WriteLn('board.  The program will prompt the user for a digital value between 0   ');
   WriteLn('15. The program will output this value to digital output bits and then   ');
   WriteLn('read it back on the digital input channels. This demos setting the       ');
   WriteLn('digital output bits(task 13)and reading the digital input bits(task 14). ');
   WriteLn;
   WriteLn;
   Address := AskForBaseAddress('350');

   ClrScr;
   WriteLn;
   WriteLn;
   WriteLn;
   WriteLn('Board Configuration:');
   WriteLn;
   WriteLn(' -- IRQ5 is used for interrupts              (required)');
   WriteLn(' -- Polarity set to bipolar                  (required)');
   WriteLn(' -- DMA channel 1                            (required)');
   WriteLn(' -- On board clock set to 1 MHz              (required)');
   WriteLn(' -- Also, the following jumps should be installed.');
   WriteLn('      -- OP0 pin 23 to IP0 pin 25');
   WriteLn('      -- OP1 pin 4 to IP1 pin 6');
   WriteLn('      -- OP2 pin 22 to IP2 pin 24');
   WriteLn('      -- OP3 pin 3 to IP3 pin 5');
   WriteLn(' -- All remaining jumper settings are irrelevant.');
   WriteLn;
   WriteLn;
   WriteLn;
   WriteLn;
   WriteLn('Press any key to continue, or press E to exit.');
   ch := ReadKey;
   setup(Address);         { set up program and the driver }
   while (status = 0) and (ch <> 'E') and (ch <> 'e') do
      begin
      { display current values for the 8 channels }
      get_readings;
      if status = 0 then
         begin { if status > 0 then error }
         { check for program exit }
         WriteLn;
         WriteLn('Press E to exit the program.  Press any other key to rescan the data...');
         ch:=ReadKey;     { wait for key press }
         end;
      end;
END. { main program }